Breathing filter for inspiration type anesthesia

Abstract

The invention discloses a breathing filter for inspiration type anesthesia, which relates to the technical field of medical instruments and comprises a respirator, an air supply pipe respectively communicated with an air inlet end and an air delivery end of the respirator, and a mask communicated with one end of the air supply pipe, the pressure sensor is arranged on one air feeding pipe, the through pipe is communicated with the pressure sensor, and the air conveying cavity is communicated with the bottom of the through pipe. By means of the breathing filter for anesthesia, the problems that when a patient exhales in an existing breathing filter for anesthesia, gas exhaled by the patient carries the body temperature of 37 DEG C and high humidity (relative humidity is close to 100%), the warm and humid gas continuously impacts a filter element of the filter, and the filter element is not prone to damage are solved. The problems that moisture absorption materials (such as calcium alginate and cellulose acetate) in the filter element quickly absorb moisture and substances such as respiratory tract secretions, sputum and aerosol in exhaled air, and the substances are mixed with water vapor and attached to the surface of the filter element, so that fibers of the filter element expand, and pores are blocked are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an inhalation anesthesia breathing filter. BACKGROUND

[0002] The inhalation anesthesia breathing filter is a device specially designed for use in the anesthesia process, installed in the breathing circuit, and used to filter the gas inhaled by the patient. It can effectively remove impurities, microorganisms, particulate matter, etc. in the gas, ensuring that the gas inhaled by the patient is clean and safe, and reducing the risk of anesthesia-related complications.

[0003] For example, the inhalation anesthesia machine for general anesthesia disclosed in CN109731200B includes a main machine, an oxygen tank, a connector one, an airway one, a carbon dioxide tank, a connector two, an airway two, a dispensing tank, an anesthesia tank, an atomization tank, a liquid pipe, an inhalation air pipe, a breathing mask, a CPU, a memory, a signal amplifier, a transformer, a display, and a tension sensor. When the tension sensor passes through the signal amplifier and enters the CPU, the CPU determines that the patient is in an inhalation state, the gas valve is opened, and the dispensed air enters the human body through the inhalation air pipe. When the tension sensor signal decreases, the CPU determines that the patient is exhaling, and the inhalation pump works to suck the exhaled gas into the filter. The gas flow direction function of the inhalation air pipe and the exhalation air pipe is controlled by a one-way check valve. However, the existing anesthesia breathing filter still has some shortcomings.

[0004] The existing anesthesia breathing filter requires the exhaled gas to pass through the filter again during the patient's exhalation process. This process not only increases the complexity of the breathing circuit, but also may cause the following risks: on the one hand, the exhaled gas of the patient carries a body temperature of 37℃ and high humidity (relative humidity close to 100%), and these warm and humid gases continuously impact the filter element, causing the hygroscopic material (such as calcium alginate and cellulose acetate) in the filter element to quickly absorb moisture; on the other hand, the respiratory tract secretions, sputum, aerosols, and other substances in the exhaled gas will mix with water vapor and adhere to the surface of the filter element, causing the filter element fibers to swell and the pores to be blocked.

[0005] In view of the above problems, it is necessary to make innovative design on the basis of the original inhalation anesthesia breathing filter. SUMMARY

[0006] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too simple, and provides a solution that is significantly different from the existing technology. Specifically, the purpose of the present invention is to provide an inhalation anesthesia breathing filter to solve the problem proposed in the above background technology that during the patient's exhalation process, the patient's exhaled gas carries a body temperature of 37°C and high humidity (relative humidity is close to 100%). These warm and humid gases continuously impact the filter element, causing the hygroscopic material (such as calcium alginate and cellulose acetate) in the filter element to quickly absorb moisture. Respiratory secretions, sputum, aerosols and other substances in the exhaled gas will mix with water vapor and adhere to the surface of the filter element, causing the filter element fibers to expand and the pores to be blocked.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a breathing filter for inhaled anesthesia, comprising a respirator, an air supply pipe respectively connecting the air inlet end and the air supply end of the respirator, and a mask connected to one end of the air supply pipe, and also comprising a pressure sensor arranged on one of the air supply pipes, a through pipe connected to the pressure sensor, an air supply cavity connected to the bottom of the through pipe, a switching component fixedly connected to the bottom of the air supply cavity for regulating the exhalation channel based on pressure, and a filter cavity for filtering the exhaled gas, wherein the filter cavities are specifically two and symmetrically distributed, a vent hole is provided at the top of the filter cavity, a gas circulation component for accelerating the drying of the internal filter element is provided on the filter cavity, and a sensor drive component for driving the switching component to switch the exhalation channel and the gas circulation component to open and close is provided on the outer wall of the switching component.

[0008] Preferably, the switching assembly includes a switching chamber connected to the bottom of the through tube, and a blocking piece slidably arranged in the switching chamber for switching the exhalation channel, one end of the blocking piece is provided with a through hole for air outlet, the outer wall of the blocking piece located in the switching chamber is provided with a spring, the bottom of the blocking piece is fixedly connected to a push rod, and the bottom of the push rod is exposed outside the switching chamber.

[0009] Preferably, the gas circulation component includes connecting blocks arranged at equal angles on the outer wall of the filter chamber, the connecting blocks are symmetrically distributed up and down, an auxiliary wheel is rotatably arranged at the center of the connecting block, a driving ring is rotatably arranged on the outer wall of the filter chamber, the inner wall of the driving ring is in contact with the auxiliary wheel, and the outer wall of the driving ring is fixedly connected to a shift rod distributed at equal angles.

[0010] Preferably, a driven rod for driving the driving ring to rotate is fixedly connected to the outer wall of the driving ring, and a movable groove is provided in the driven rod.

[0011] Preferably, the outer wall of the filtering cavity is rotationally provided with driving rods distributed at equal angles, the inner wall of the driving rod is provided with a waist groove, the driving rod is located in the waist groove, and the end of the driving rod penetrating through the outer wall of the filtering cavity is fixedly connected with a sheet in the filtering cavity.

[0012] Preferably, the sensing driving assembly comprises a base fixedly connected to the outer wall of the switching cavity, a motor fixedly connected to the base, and a driving gear fixedly connected to the output end of the motor, the driving plate is slidingly arranged below the motor, the center of the driving plate is provided with a connecting groove, and the inner walls of the two sides of the connecting groove are both provided with a rack.

[0013] Preferably, the driving plate is provided with a driving groove, the driving groove is slidingly provided with a push rod, and one end of the push rod is arranged in the movable groove.

[0014] Preferably, the top of the driving plate is fixedly connected with a push block, and the push block is used for pushing the jacking top rod to move upwards.

[0015] Preferably, the end of the gas conveying cavity is fixedly connected with a gas conveying pipe, and the end of the gas conveying pipe is fixedly connected with the top of the filtering cavity.

[0016] Preferably, the other end of the sheet is fixedly connected with a rotating shaft, and the rotating shaft is rotationally connected with the outer wall of the end of the gas conveying pipe in the filtering cavity.

[0017] Compared with the prior art, the present application has the following beneficial effects: 1、After the sensing driving assembly receives the signal of the blocking of the filtering cavity, the motor is started, the driving gear at the output end of the motor rotates, and through the meshing with the racks on the driving plate, the driving plate is driven to slide in the horizontal direction. The sliding of the driving plate simultaneously drives the push rod and the push block to slide. The push rod slides in the driving groove, and through the movement of the end of the push rod in the movable groove of the driven rod, the driven rod is driven to rotate. The rotation of the driven rod drives the driving ring to rotate, the driving rod in the waist groove of the driving ring slides, and then the driving rod is driven to rotate. The rotation of the driving rod drives the sheet to rotate, opens the air flow passage in the filtering cavity, and makes the external air enter the filtering cavity through the passage, conducts the humid gas on the surface of the filter core, and accelerates the drying process of the filter core.

[0018] 2、The push block pushes the jacking top rod to move upwards, the jacking top rod drives the blocking piece to slide in the switching cavity, with the sliding of the blocking piece, the exhalation passage originally connected with the blocked filtering cavity is gradually blocked, meanwhile, the through hole on the blocking piece is gradually connected with another unblocked filtering cavity, the switching of the exhalation passage is realized, and the exhaled gas is guided into the unblocked filtering cavity for filtering. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The whole structure of the anesthesia respirator of the present application.

[0020] Figure 2 The whole structure of the anesthesia respirator of the present application.

[0021] Figure 3 The structure of the double-cavity filter of the present application.

[0022] Figure 4 The structure of the double-cavity filter of the present application.

[0023] Figure 5 The structure of the bidirectional switching of the present application.

[0024] Figure 6 The structure of the bidirectional switching of the present application.

[0025] Figure 7 The internal structure of the bidirectional switching of the present application.

[0026] Figure 8 The structure of the filter cavity of the present application.

[0027] Figure 9 The internal gas flow assembly of the filter cavity of the present application.

[0028] Figure 10 The switching assembly of the present application.

[0029] Figure 11 The structure of the A of the present application. Figure 8 The enlarged structure of the A of the present application.

[0030] In the figure: 1, respirator; 2, face mask; 3, pressure sensor; 4, gas delivery cavity; 5, switching cavity; 501, through pipe; 6, motor; 7, driving plate; 701, driving groove; 702, push block; 8, filter cavity; 801, air hole; 9, gas delivery pipe; 10, air delivery pipe; 11, push rod; 12, rack; 13, plugging piece; 1301, through hole; 1302, ejector rod; 14, spring; 15, driving gear; 16, driven rod; 17, sheet; 18, driving ring; 19, connecting block; 1901, auxiliary wheel; 20, driving rod; 21, lever. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0032] Referring to Figures 1 to 11 The application provides a technical scheme: a breathing filter for inhalation anesthesia, which comprises a respirator 1, gas supply pipes 10 respectively connected with the gas inlet end and the gas outlet end of the respirator 1, a face mask 2 connected with one end of the gas supply pipe 10, a pressure sensor 3 arranged on one of the gas supply pipes 10, a through pipe 501 connected with the pressure sensor 3, a gas supply cavity 4 connected with the bottom of the through pipe 501, a switching assembly arranged at the bottom of the gas supply cavity 4 and used for adjusting the exhalation passage based on pressure, and filter cavities 8 used for filtering exhalation gas, wherein the filter cavities 8 are two and symmetrically distributed, air holes 801 are arranged at the top of the filter cavities 8, gas flow assemblies used for accelerating drying of internal filter elements are arranged on the filter cavities 8, and the outer wall of the switching assembly is provided with a sensing driving assembly used for driving the switching assembly to switch the exhalation passage and the opening and closing of the gas flow assembly.

[0033] As the embodiment, first, anesthetic gas is sent into the face mask 2 through the gas supply pipe 10, so that the patient starts to inhale the anesthetic gas for anesthesia, when the patient exhales, the gas is sent into the filter cavities 8 through the gas supply pipe 10 for filtering, and then the filtered gas is sent into the respirator 1, when one of the filter cavities 8 is blocked, the filter element in the blocked filter cavity 8 is gradually blocked by the humid gas exhaled by the patient and the respiratory tract secretions, sputum, aerosols and other substances in the exhaled gas, at this time, a certain air pressure is generated in the gas supply pipe 10 due to the blockage of the filter cavity 8, the air pressure is received by the pressure sensor 3, and the signal is input to the sensing driving assembly through the pressure sensor 3, so that the sensing driving assembly drives the switching assembly to switch the exhalation passage in the gas supply cavity 4, so that the switching assembly blocks the exhalation passage of the blocked filter cavity 8, and the exhaled gas is sent into the unblocked filter cavity 8, and the sensing driving assembly opens the gas flow assembly on the blocked filter cavity 8 at the same time, so that the internal filter element is further dried by the auxiliary convection of air, and the gas flow assembly of the unblocked filter cavity 8 is closed by the sensing driving assembly, so as to facilitate the filtration of the exhaled gas, and the filtered gas is sent into the respirator 1 again through the gas supply pipe 10 connected with the bottom of the filter cavity 8.

[0034] The switching assembly comprises a switching cavity 5 connected with the bottom of the through pipe 501, a blocking piece 13 arranged in the switching cavity 5 and used for switching the exhalation passage, a through hole 1301 for gas outlet is arranged at one end of the blocking piece 13, a spring 14 is arranged on the outer wall of the blocking piece 13 in the switching cavity 5, a top rod 1302 is fixedly connected to the bottom of the blocking piece 13, and the bottom of the top rod 1302 is exposed outside the switching cavity 5.

[0035] In this embodiment, under normal operating conditions, the blocking member 13 is maintained in its initial position by the action of the spring 14, and the exhaled gas is filtered through one of the filter chambers 8. When the filter chamber 8 becomes clogged, air pressure is generated in the air supply pipe 10. After receiving the air pressure signal, the pressure sensor 3 transmits the signal to the sensor drive assembly. After receiving the signal, the sensor drive assembly applies an external force to the push rod 1302, which then pushes the blocking member 13 upward to slide within the switching chamber 5. As the blocking member 13 slides, the exhalation channel originally connected to the clogged filter chamber 8 is gradually blocked. At the same time, the through hole 1301 on the blocking member 13 gradually connects to the other unblocked filter chamber 8, achieving the switching of the exhalation channel.

[0036] The gas circulation component includes connecting blocks 19 arranged at equal angles on the outer wall of the filter chamber 8. The connecting blocks 19 are symmetrically distributed up and down. An auxiliary wheel 1901 is rotatably provided at the center of the connecting block 19. A driving ring 18 is rotatably provided on the outer wall of the filter chamber 8. The inner wall of the driving ring 18 is in contact with the auxiliary wheel 1901. The outer wall of the driving ring 18 is fixedly connected to a shift rod 21 distributed at equal angles.

[0037] A driven rod 16 for driving the driving ring 18 to rotate is fixedly connected to the outer wall of the driving ring 18 , and a movable groove is defined in the driven rod 16 .

[0038] The outer wall of the filter chamber 8 is rotatably provided with drive rods 20 distributed at equal angles. The inner wall of the drive rod 20 is provided with a waist groove, and the shift rod 21 is located in the waist groove. The drive rod 20 passes through the outer wall of the filter chamber 8, and one end of the drive rod 20 located in the filter chamber 8 is fixedly connected to a thin film 17. The thin film 17 is driven to rotate by the drive rod 20 to open and close to form an air circulation valve.

[0039] In this embodiment, during normal operation, the air flow assembly is closed, with the lamella 17 blocking the air flow path, ensuring that air within the filter chamber 8 is filtered only through the filter element. When the sensor drive assembly detects that the filter chamber 8 needs to accelerate filter element drying (for example, when the filter chamber 8 becomes clogged due to excessive humidity), it applies a rotational driving force to the driven rod 16. This drives the drive ring 18 to rotate, and the lever 21 on the drive ring 18 slides within the groove of the drive rod 20, thereby rotating the drive rod 20. The rotation of the drive rod 20 in turn rotates the lamella 17, opening the air flow path within the filter chamber 8. External air can now enter the filter chamber 8 through this path, circumventing the moist air on the filter element surface and accelerating the filter element drying process. When the filter element is completely dried or another filter chamber 8 begins to become clogged, the sensor drive assembly reverses the drive rod 16. The driving ring 18 rotates in the reverse direction and drives the sheet 17 to rotate to a re-closed state through the shifting rod 21 and the driving rod 20 , thereby cutting off the air circulation channel and restoring the normal filtering function of the filter chamber 8 .

[0040] The sensing drive assembly includes a base fixedly connected to the outer wall of the switching chamber 5, a motor 6 fixedly connected to the base, and a driving gear 15 fixedly connected to the output end of the motor 6. A driving plate 7 is slidably arranged directly below the motor 6. A connecting groove is provided in the center of the driving plate 7. Racks 12 are provided on the inner walls on both sides of the connecting groove, and the racks 12 are engaged with the driving gear 15.

[0041] A driving groove 701 is formed on the driving plate 7 , and a push rod 11 is slidably arranged in the driving groove 701 , and one end of the push rod 11 is arranged in the movable groove.

[0042] A push block 702 is fixedly connected to the top of the driving plate 7, and the push block 702 is used to push the lifting rod 1302 to move upward.

[0043] As this embodiment, when the pressure sensor 3 detects abnormal air pressure in the air supply pipe 10 (such as increased air pressure due to blockage of the filter chamber 8), it will transmit a signal to the motor 6, and then the motor 6 will start. The rotation of the motor 6 drives the drive gear 15 to rotate, and the drive gear 15 engages with the rack 12 on the drive plate 7, thereby driving the drive plate 7 to slide in the horizontal direction. The sliding of the drive plate 7 will simultaneously drive the push rod 11 and the push block 702 to slide. The push rod 11 slides in the driving groove 701, and through the movement of its end in the movable groove of the driven rod 16, drives the driven rod 16 to rotate, and then drives the gas circulation component to open the air circulation channel of the blocked filter chamber 8, accelerating the drying of the filter element. At the same time, the push block 702 will push the push rod 1302 to move upward, and the push rod 1302 drives the blocking member 13 to slide in the switching chamber 5, blocking the exhalation channel of the blocked filter chamber 8, and guiding the exhaled gas to the unblocked filter chamber 8 for filtration. When the blockage problem of the filter chamber 8 is solved and the other filter chamber 8 begins to gradually become blocked, the control system will control the motor 6 to rotate in the opposite direction, so that the driving plate 7 is reset, thereby driving the push rod 11 and the push block 702 to reset, closing the gas circulation channel and restoring the normal filtering function of the filter chamber 8.

[0044] The ends of the air delivery cavity 4 are fixedly connected to the air delivery pipe 9 , and the ends of the air delivery pipe 9 are fixedly connected to the top of the filter cavity 8 .

[0045] In this embodiment, the gas delivery pipe 9 transmits the anesthetic gas from the gas delivery cavity 4 to the top of the filter cavity 8. Since the gas delivery pipe 9 is fixedly connected to the top of the filter cavity 8, the anesthetic gas can smoothly enter the interior of the filter cavity 8.

[0046] The other end of the sheet 17 is fixedly connected to a rotating shaft, and the rotating shaft is rotatably connected to the outer wall of one end of the air supply pipe 9 located in the filter cavity 8.

[0047] Working principle: when using the inhalation anesthesia breathing filter, first, the anesthetic gas is sent into the mask 2 through the gas inlet pipe 10, the patient inhales the anesthetic gas through the mask 2 to start the anesthesia process, when the patient exhales, the exhaled gas is sent into the filter cavity 8 through the gas outlet pipe 10 for filtering. The filter cavity 8 is provided with a filter element for removing impurities, respiratory tract secretions, sputum, aerosol and other substances in the exhaled gas to ensure the cleanliness of the exhaled gas. The filtered gas is then sent back into the respirator 1 through the gas pipe 10 connected at the bottom of the filter cavity 8 for subsequent processing or discharge; In normal working condition, the blocking piece 13 in the switching assembly is kept in the initial position under the action of the spring 14, at this time, the exhaled gas is filtered through one of the filter cavities 8, and the gas flow-through assembly is in the closed state, the sheet 17 blocks the area in the filter cavity 8 that may form an air bypass except the gas inlet of the gas inlet pipe 9, to ensure that the gas is filtered only through the filter element, however, when one of the filter cavities 8 is blocked, the filter element in the blocked filter cavity 8 will gradually be blocked due to the humid gas exhaled by the patient and the impurities in the exhaled gas. At this time, a certain air pressure is generated in the gas outlet pipe 10 due to the blockage of the filter cavity 8. After receiving the air pressure signal, the pressure sensor 3 transmits the signal to the sensing and driving assembly; After receiving the signal, the motor 6 starts, the drive gear 15 at the output end of the motor 6 rotates, and through the meshing with the rack 12 on the driving plate 7, the driving plate 7 is driven to slide in the horizontal direction. The sliding of the driving plate 7 simultaneously drives the push rod 11 and the push block 702 to slide. The push rod 11 slides in the driving groove 701, and through the movement of its end in the movable groove of the driven rod 16, the driven rod 16 is rotated. The rotation of the driven rod 16 drives the driving ring 18 to rotate, the lever 21 on the driving ring 18 slides in the waist groove of the driving rod 20, and then drives the driving rod 20 to rotate. The rotation of the driving rod 20 drives the sheet 17 to rotate, opens the air flow-through channel in the filter cavity 8, so that the external air can enter the filter cavity 8 through the channel, and the humid gas on the surface of the filter element is counterflowed to accelerate the drying process of the filter element; At the same time, the push block 702 pushes the top rod 1302 to move upwards, the top rod 1302 drives the blocking piece 13 to slide in the switching cavity 5. With the sliding of the blocking piece 13, the exhalation channel originally connected with the blocked filter cavity 8 is gradually blocked, and at the same time, the through hole 1301 on the blocking piece 13 gradually communicates with another unblocked filter cavity 8, realizing the switching of the exhalation channel and guiding the exhaled gas to the unblocked filter cavity 8 for filtering.

[0048] When the filter core in the clogged filter cavity 8 is dried or another filter cavity 8 also starts to be gradually clogged, the sensor driving assembly controls the motor 6 to rotate reversely, so as to reset the driving plate 7. The reset of the driving plate 7 drives the push rod 11 and the push block 702 to reset, thereby closing the gas flow passage, and making the blocking member 13 return to the initial position under the action of the spring 14, so as to restore the normal filtering function of the filter cavity 8. At this time, the exhaled gas will be filtered again through the un-clogged filter cavity 8 and re-enter the respirator 1.

[0049] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can make modifications to the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A breathing filter for inhalation anesthesia, comprising a respirator (1), an air supply pipe (10) respectively connecting an air inlet end and an air supply end of the respirator (1), and a mask (2) connected to one end of the air supply pipe (10), characterized in that: The invention also includes a pressure sensor (3) arranged on one of the air supply pipes (10), a through pipe (501) connected to the pressure sensor (3), an air delivery cavity (4) connected to the bottom of the through pipe (501), a switching component fixedly connected to the bottom of the air delivery cavity (4) for regulating the exhalation channel based on pressure, and a filter cavity (8) for filtering the exhaled gas, wherein the filter cavities (8) are specifically two and symmetrically distributed, a vent hole (801) is opened on the top of the filter cavity (8), a gas circulation component for accelerating the drying of the internal filter element is provided on the filter cavity (8), and a sensor drive component for driving the switching component to switch the exhalation channel and the gas circulation component to open and close is provided on the outer wall of the switching component.

2. A breathing filter for inhalation anesthesia according to claim 1, characterized in that: The switching assembly comprises a switching chamber (5) connected to the bottom of the through pipe (501), a blocking member (13) slidably arranged in the switching chamber (5) for switching the exhalation channel, one end of the blocking member (13) is provided with a through hole (1301) for air outlet, the outer wall of the blocking member (13) located in the switching chamber (5) is provided with a spring (14), the bottom of the blocking member (13) is fixedly connected to a push rod (1302), and the bottom of the push rod (1302) is exposed outside the switching chamber (5).

3. The breathing filter for inhalation anesthesia according to claim 1, characterized in that: The gas circulation component comprises connecting blocks (19) arranged at equal angles on the outer wall of the filter chamber (8), the connecting blocks (19) being symmetrically distributed up and down, an auxiliary wheel (1901) being rotatably arranged at the center of the connecting block (19), a driving ring (18) being rotatably arranged on the outer wall of the filter chamber (8), the inner wall of the driving ring (18) being in contact with the auxiliary wheel (1901), and a shifting rod (21) being fixedly connected to the outer wall of the driving ring (18) being distributed at equal angles.

4. The breathing filter for inhalation anesthesia according to claim 3, characterized in that: A driven rod (16) for driving the driving ring (18) to rotate is fixedly connected to the outer wall of the driving ring (18), and a movable groove is provided in the driven rod (16).

5. The breathing filter for inhalation anesthesia according to claim 3, characterized in that: The outer wall of the filter chamber (8) is rotatably provided with driving rods (20) distributed at equal angles. The inner wall of the driving rod (20) is provided with a waist groove, and the shifting rod (21) is located in the waist groove. The driving rod (20) passes through the outer wall of the filter chamber (8), and one end of the driving rod (20) located in the filter chamber (8) is fixedly connected to a thin sheet (17). The thin sheet (17) is driven to rotate by the driving rod (20) to open and close to form an air circulation valve.

6. The breathing filter for inhalation anesthesia according to claim 1, characterized in that: The sensing drive assembly comprises a base fixedly connected to the outer wall of the switching chamber (5), a motor (6) fixedly connected to the base, and a driving gear (15) fixedly connected to the output end of the motor (6). A driving plate (7) is slidably arranged directly below the motor (6). A connecting groove is provided at the center of the driving plate (7). Racks (12) are provided on both sides of the inner walls of the connecting groove. The racks (12) are meshed with the driving gear (15).

7. The breathing filter for inhalation anesthesia according to claim 6, characterized in that: A driving groove (701) is provided on the driving plate (7), a push rod (11) is slidably arranged in the driving groove (701), and one end of the push rod (11) is arranged in the movable groove.

8. The breathing filter for inhalation anesthesia according to claim 7, characterized in that: A push block (702) is fixedly connected to the top of the driving plate (7), and the push block (702) is used to push the lifting rod (1302) upward.

9. The breathing filter for inhalation anesthesia according to claim 1, characterized in that: The ends of the air delivery cavity (4) are fixedly connected to an air delivery pipe (9), and the ends of the air delivery pipe (9) are fixedly connected to the top of the filter cavity (8).

10. The breathing filter for inhalation anesthesia according to claim 5, characterized in that: The other end of the sheet (17) is fixedly connected to a rotating shaft, and the rotating shaft is rotatably connected to the outer wall of one end of the air supply pipe (9) located in the filter cavity (8).

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